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प्रश्न
Give reasons for the following.
Sodium and potassium are stored in kerosene.
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उत्तर
Sodium and potassium are stored in kerosene because they are highly reactive elements. They can easily catch fire even when in contact with air.
संबंधित प्रश्न
Which of the following alloys contains mercury as one of the constituents?
Why is hydrogen placed with alkali metals?
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Hydrochloric acid,
What was Mendeleev's basis for the classification of elements?
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
An amorphous substance which turns from pale green to black on strong heating evolving a colourless, acidic gas as the only gaseous product.
Aluminium: _______: gold : : electric insulator
Match the columns.
| Group A | Group B |
| 1) Copper and Zinc | a) Brass |
| 2) Copper and Tin | b) Bronze |
| c) Stainless steel |
An element which is always lustrous, malleable and ductile is ______.
The metal can be cut with a knife ______.
Compare the conductivity of metals and non–metals.
